FPS Monitor is the best overlay. MSI Afterburner is the best free overlay. If you have $10, buy the activation code to support the developer and avoid messing with registry files.
: After a successful purchase on the official FPS Monitor website , an activation code is sent to your email. If you don't see it, check your spam folder or contact their manual support to have it resent. fps+monitor+activation+code
The software typically operates under a "Freemium" or "Shareware" model. FPS Monitor is the best overlay